We initially designed these shift shafts for use in Suzuki powered Radical road racing cars. These cars weigh more than twice as much as a motorcycle and put tremendous stresses on the transmissions with constant up shifting and down shifting.The problem.....the oem shift shafts were bending and flexing which wallers out and oblongs the shift shaft holes in the cases which eventually scraps the cases.The solution...... It is well known that APE builds the strongest, no flex, tool steel wrist pins in the industry. The very same pins that Spiderman McBrides uses to run those five second ETs. So why not use this expertise to build a no flex shift shaft. And that is just what we have done. Tool steel shift shafts, just like McBride's wrist pins.